[FFmpeg-trac] #10427(avfilter:new): Confusion between "luminance" and "luma" in geq documentation

[FFmpeg]

#10427: Confusion between "luminance" and "luma" in geq documentation
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             Reporter:  Mingye Wang  |                     Type:  defect
               Status:  new          |                 Priority:  normal
            Component:  avfilter     |                  Version:  git-
                                     |  master
             Keywords:  terminology  |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
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 Summary of the bug: "Luminance" refers to a physical quantity calculated
 from R, G, and B; "[https://en.wikipedia.org/wiki/Luma_(video) luma]" is
 the video stuff we use calculated from R', G', and B'. The current
 documentation for vf_geq.c uses the word "luminance", but it clearly deals
 with the latter.

 The term "Chrominance" is acceptable and does not need to be changed.

 How to reproduce: Navigate to https://ffmpeg.org/ffmpeg-filters.html#geq.
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Ticket URL: <https://trac.ffmpeg.org/ticket/10427>
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